Line narrowing of electromagnetically induced transparency in Rb with a longitudinal magnetic field

Abstract

Electromagnetically induced transparency ͑EIT͒ experiments in ⌳-type systems benefit from the use of hot vapor where the thermal averaging results in reducing the width of the EIT resonance well below the natural linewidth. Here, we demonstrate a technique for further reducing the EIT width in room-temperature vapor by the application of a small longitudinal magnetic field. The Zeeman shift of the energy levels results in the formation of several shifted subsystems; the net effect is to create multiple EIT dips each of which is significantly narrower than the original resonance. We observe a reduction by a factor of 3 in the D 2 line of 87 Rb with a field of 3.2 G.

Study of a four-level system in vee + ladder configuration

“…3, confirm our earlier observation of linewidth reduction in Ref. [17]. The main results are the same as that seen for stationary atoms-an EIT dip for a three-level system when one of the control fields has zero strength; an EIA peak when the two control fields are equal; and the EIA peak splitting into two when the control fields have unequal strengths.…”

Electromagnetically induced transparency in Λ-systems of 87Rb atom in magnetic field

“…In the experiments, the power of the probe beam was fixed at P p = 0.08 mW (Rabi frequency Ω p = 2π [34][35][36]. Among these absorption dips, only dip b exhibits an EIT peak due to the fulfillment of the two-photon resonance condition.…”

Microwave assisted transparency in an M-system

“…First we discuss the role of individual control fields one by one and finally the MW field. There is a broad Lorentzian profile having a full width at half maximum of Γ 2 which is 2π× 6 MHz in this case [7,8]. At the line centre of the Lorentzian profile, the probe response develops a sharp EIT dip in the presence of the control field Ω 23 [7,36].…”